Getting Started With The Java Message Service.

Remote Procedure Call (RPC) system, including Java RMI

, synchronous caller will block and wait for the called method completes execution, and so can not offer the development of weak corporate applications, among many topics. In other words, the RPC system requires that the client and server are available at the same time. However, such a close interaction may not be feasible or desired in some applications. Message-oriented middleware (MOM) to solve these problems. Asynchronous interaction model they are based, and provide a number of messages that can be accessed through a network of abstraction. However, keep in mind that the message here refers to asynchronous requests or events that are consumed by enterprise applications and non-human, as electronic mail (e-mail). These messages are formatted data that describe specific business actions.

JMS - Java message service - has been designed a number of years ago by Sun Microsystems. They worked together with a number of other companies within the community. This message que is the first API that was supported across the industry. JMS' original design was to help business applications to become more user friendly. These applications have to send and receive data and events asynchronously. The API is a common one and is designed to be efficient and easy and it supported by a whole range of other messaging products.

There are two main messaging models supported by JMS, being publish subscribe and point to point (also known as queuing). A Java application is allowed to use enterprise-messaging systems through mq Java. What is more important, however, is that all Java applications can access these systems in the same manner. JMS is a type of middleware. It is also often referred to as MOM - Message Orientated Middleware - and this is an abstraction that is quite low level. It runs beneath other levels include application and database adapters, but also business process automation and event processing. MOM is more and more common as an application in integrating operations across companies. This is because it allows different components of a business to combine into a flexible and reliable system.Java message service also defines a number of semantics and interfaces. These, in turn, allow the applications to communicate with all the other messaging implementations.

This implementation is also known as a JMS provider. Through JMS, the learning curve is made very easy because there are only a minimal number of concepts that anybody who works in developing Java has to learn. In learning these, he or she will learn how to use all the messaging products within the enterprise. The portability of all the messaging applications is then maximized.Different parts make up a JMS application. First, there is the provider, which is responsible for the implementation of the JMS specification. Then, there are the JMS clients. The clients are the applications that receive and send messages, possibly leaving them in the message que. Next, there are the messages themselves. Messages are the communication methods between the clients. Lastly, there are the administered objects, which are created to be used by clients of JMS.

There are two message delivery methods. The first is point to point, or mq java. Here, the message is delivered to the queue and then to the consumers who are registered for that queue. The amount of producers that can send to the queue is unlimited. Each message will be delivered and each costumer consumes one message. Hence, if no consumers are registered, the messages will remain in the queue. The other type is publish subscribe. Here the producer sends a message to a range of consumers.

The message goes to the topic destination and any number of consumers can read them. If there aren't any consumers registered, the destination will not hold the messages, unless specified. It can be specified through a durable subscription, which means someone is actually registered to the topic but has been inactive for a while. With both methods, once a consumer appears or once again becomes active, the messages will be delivered.

by: MINU

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